问题描述：
[单选]
（英英释义）Return lines need not be shown in entirety unless needed to understand the system．
A．You do not need to give the return processes in its entirety unless you need to comprehend the system.
B．Unless you need to understand the system,do not need to fully show the return lines.
C．Return procedures need not be shown completely if you need to realize the system.
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